теперь еще и удаляется все грамотно

backend/src/main/java/com/example/backend/favorites/repository/FavoriteRepository.java

@@ -16,4 +16,6 @@ public interface FavoriteRepository extends CrudRepository<FavoriteEntity, Integ
 
     Optional<FavoriteEntity> deleteByMovieId(Integer movieId);
 
+    Optional<FavoriteEntity> deleteByUserId(Integer user);
+
 }

backend/src/main/java/com/example/backend/users/service/UserService.java

@@ -8,7 +8,6 @@ import org.springframework.security.core.userdetails.UserDetails;
 import org.springframework.security.core.userdetails.UserDetailsService;
 import org.springframework.security.core.userdetails.UsernameNotFoundException;
 import org.springframework.security.crypto.password.PasswordEncoder;
-import org.springframework.security.core.Authentication;
 import org.springframework.stereotype.Service;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Sort;
@@ -21,19 +20,27 @@ import java.util.stream.StreamSupport;
 import com.example.backend.core.configurations.Constants;
 import com.example.backend.core.errors.NotFoundException;
 import com.example.backend.core.security.UserPrincipal;
+import com.example.backend.favorites.repository.FavoriteRepository;
 import com.example.backend.users.model.UserEntity;
 import com.example.backend.users.model.UserRole;
 import com.example.backend.users.repository.UserRepository;
+import com.example.backend.viewed.repository.ViewedRepository;
 
 @Service
 public class UserService implements UserDetailsService {
 
     private final UserRepository repository;
     private final PasswordEncoder passwordEncoder;
+    private final FavoriteRepository favoriteRepository;
+    private final ViewedRepository viewedRepository;
 
-    public UserService(UserRepository repository, PasswordEncoder passwordEncoder) {
+    public UserService(UserRepository repository, PasswordEncoder passwordEncoder,
+            FavoriteRepository favoriteRepository,
+            ViewedRepository viewedRepository) {
         this.repository = repository;
         this.passwordEncoder = passwordEncoder;
+        this.favoriteRepository = favoriteRepository;
+        this.viewedRepository = viewedRepository;
     }
 
     private void checkLogin(Integer id, String login) {
@@ -94,6 +101,9 @@ public class UserService implements UserDetailsService {
     @Transactional
     public UserEntity delete(Integer id) {
         final UserEntity existsentity = get(id);
+        favoriteRepository.deleteByUserId(existsentity.getId());
+        viewedRepository.deleteByUserId(existsentity.getId());
+
         repository.delete(existsentity);
         return existsentity;
     }

backend/src/main/java/com/example/backend/viewed/repository/ViewedRepository.java

@@ -17,4 +17,6 @@ public interface ViewedRepository extends CrudRepository<ViewedEntity, Integer>
 
     Optional<ViewedEntity> deleteByMovieId(Integer movieId);
 
+    Optional<ViewedEntity> deleteByUserId(Integer user);
+
 }